On Thu, 15 Apr 1999 19:12:16 +0300, "Margus Ramst"
<mar### [at] peakeduee> wrote:

>What's an Oren-Neyler-Blinn surface model, and would I want to have it in
>POV? I would, wouldn't I :)

This probably refers to the Oren-Nayar reflectance model.  It is a
diffuse lighting model that handles rough surfaces more accurately
than the usual Lambertian model.  Larry Gritz has a Renderman shader
for BMRT that does the Oren-Nayar model if you want to look at that.
The relevant paper is:
Oren, Michael and Shree K. Nayar
Generalization of Lambert's reflectance model
Computer Graphics Annual Conference Series 1994 (SIGGraph 94)
pp. 239 to 246
It doesn't look like it would be too tough to add to POV.  You can get
the shader at the RenderMan Repository if you want to study the code.

Jerry Anning
clem "at" dhol "dot" com

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